262 British Uj^edinece and UstilaginecE. 



Uredo orchidis. Mart. Cooke, " Hdbk.," p. 527; "Micro. 

 Fungi," 4th edit., p. 216. 



Exsiccati. 

 Cooke, i. 61 ; ii. 323. 



On Orchis 7naculata, lati/olia, Listera ovaia. 

 May and June. 



Biology. — In view of so many statements having been made that 

 the Caeomata are the aecidiospores of the Melampsorse, I have made 

 several cultures with the teleutospores of M. betulince on Orchis 

 niaculata and lati/o/ia, but always without result (Exp. 256, 284, 343). 

 I was led to do so from finding C. orchidis under a birch-tree affected 

 with the Melampsora, but I feel sure there is no connection between 

 these two fungi. 



'&' 



Caeoma laricis. (Westd.). 



Sori minute, on yellow spots, surrounded by the ruptured epi- 

 dermis and a number of barren cells. Spores subglobose or 

 elliptical, finely echinulate, orange-yellow, 15-25 x 12-18/A. 



Synonym. 

 Winter, loc. cit., p. 256. 



Uredo laricis. Westd., Bullet. Acad. Roy. Belgique, 2nd se'r., 

 tome xi., No. 34. 



On Finns larix. 

 May and June. 



Biology. — This species is not uncommon early in the year on 

 larch foliage, but is very inconspicuous and easily overlooked. From 

 certain reasons I was led to apply the spores to a plant of Scnecio 

 jacobcea, but they produced no result. The investment of barren cells 

 shows its relationship to the vEcidia. Hartig has more recently 

 asserted that this species is connected with one form of Melampsora 

 tremtila; and Professor Trail has found them growing in company 

 near Aberdeen (see p. 241). 



^CIDIUM. 



Spores surrounded by a pseudoperidium ; produced in basipetal 

 series. Germination as in Uredo. 



